Improvement in ladders



UNITED STATES PATENT GEEIOE.

FREDERICK A.l COPELAND, OF LA CROSSE, WISCONSIN.

' IMPROVEMENT |N LAODERS.

Specification forming part of Letters Patent No. 204,295, dated May 28,1878 application led May 4, 157e.

To all whom it may concern:

Be it known that I, FREDERICK A. COPE- LAND, of the city and county of La Crosse, and State of Wisconsin, have invented a new and useful Improvement in Ladders; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention is an improvement in the class of ladders having rigid rounds, which are at tached to the ropes or other side pieces by means of screw-clamps. "m

The improvement consists in the particular construction of the clamping device, as hereinafter described.

In the accompanying drawing, forming part of this specication, Figure 1 is alongitudinal section of one of the rounds of theladder with a fragment of a rope passing through one of the eyes. Fig. 2 represents the eye and socket of the round detached. Fig. 3 represents a fragment of the ladder complete..

A indicates the ropes or parallel side pieces of the ladder. The rounds or rungs B are tubular, and provided internally at their respective ends with a right and left screwthread, a. The ends of the rounds enter circular cavities or recesses in socket C, which have a gro,ove,b, in their opposite sides to receive the ropes A. The ropes pass through the eyes of bolts D, which screw into the ends of the rounds B, as shown.

By this construction and arrangenient'of parts, it is obvious that to form a ladder the ropes A are passed through the eyes of bolts D, whose Shanks are then inserted through sockets C, and the rounds B screwed on two opposite bolts simultaneously until the ropes are clamped tightly in the grooves of the sockets by reason of the pressure between the latter and the outer side of the bolteyes.

The chief advantage of the invention over others of its kind consists in the fact that in the clamping operation the ends of the rounds do not come in contact with the ropes, and hence the fibers of the latter are not out or otherwise injured, but are clamped between FREDERICK A.v COPELAND.

. Witnesses:

' J OIIN B. WEBB,

LEVI WITHEE. 

